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Tissue is a group of cells that have similar structure and
that function together as a unit. A nonliving material, called
the intercellular matrix, fills the spaces between the cells.
This may be abundant in some tissues and minimal in others.
The intercellular matrix may contain special substances such
as salts and fibers that are unique to a specific tissue and
gives that tissue distinctive characteristics. There are four
main tissue types in the body: epithelial, connective, muscle,
and nervous. Each is designed for specific functions. Use
the hyperlinks below to branch into a tissue type and learn
more about the topic.
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